I have a question which I could not figure out for myself. If Allah truly created us in pairs like he promised us in the Holy Quran, why do some people never find a partner to marry. Like Bibi Fatme in Qom Iran or Prophet Jesus a.s. Or even females around us who are not getting any proposals.

Creating things in pairs does not mean that you and a spouse were created for one another. Every living thing was created in pairs as in a male and a female.